1.

For which of the following function is : \[\frac{f-f}{a-b}\] Constant for all number a and b where \[a\ne b\]?

A. \[f(x)=4x+7\]
B. \[f(x)=x+{{x}^{2}}\]
C. \[f(x)=\cos x\]
D. \[f(x)={{\log }_{e}}x\]
Answer» B. \[f(x)=x+{{x}^{2}}\]


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